Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1979-09-14
1981-06-09
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970, H01J 2976
Patent
active
042727057
ABSTRACT:
A cathode ray tube (CRT) in a video display utilizes an anti-ringing system for minimizing beam scanning distortion at the start of trace. This distortion is due to velocity modulation of the scanning beam caused by high frequency, resonant energy in the inductances of the linearity and width coils and the electromagnetic deflection yoke, all of which are in series. The first half of beam scan cycle is accomplished by the conduction of the damper diode while operation of the horizontal output transistor provides beam deflection current for the second half of horizontal sweep. A low impedance is introduced in the circuit for a short period during the start of damper diode current conduction by means of a voltage biasing diode network. This low impedance dampens out high frequency resonant ringing without degrading video display performance by excessive resistive loading.
REFERENCES:
patent: 3904927 (1975-09-01), Wheatley, Jr. et al.
patent: 4042858 (1977-08-01), Collette et al.
Blum Theodore M.
Hill Thomas E.
Zenith Radio Corporation
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